#include "railroad.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vii;
typedef pair<int,int> pi;
typedef vector<pi> pii;
typedef tuple<int,int,int> tii;
#define REP(i,a,b) for(int i=a;i<b;i++)
#define F first
#define S second
#define PB push_back
#define MP make_pair
#define LSOne(s) ((s)&(-s))
ll INF=1e18+10;
int inf=1e9+10;
ll M=1e9+7;
long long plan_roller_coaster(std::vector<int> s, std::vector<int> t) {
int n = (int) s.size();
pii a;
REP(i,0,n)a.PB({s[i],t[i]});
pii b=a;
ll c=0;
int k=1;
REP(i,0,n){
if(k>a[i].F)c+=k-a[i].F;
k=a[i].S;
}
ll ans=c;
next_permutation(a.begin(),a.end());
while(a!=b){
c=0;
k=1;
REP(i,0,n){
if(k>a[i].F)c+=k-a[i].F;
k=a[i].S;
}
ans=min(ans,c);
next_permutation(a.begin(),a.end());
}
return ans;
}
